Some background. Michael Shermer writes a column in Scientific American called Skeptic. He edits a journal called The Skeptic. He used to be a believer. He once wrote a book called Why People Believe Weird Things. He knows what he is talking about.
So he rightly got annoyed when the intelligent design concept began to make ground and he decided to write this thoughtful, intelligent and well written book. It is essential reading as an introduction to the against side in the on-going debate. He is not technical, not deeply scientific or philosophical: he just outlines the salient facts.
Most people reading this book will see the passion of someone who cares deeply about the truth (his earlier book spent much time concentrating on Holocaust deniers) and why the truth matters. He does not waste time praising ID for its insights - he just shows it up for what it is: a vacuous and empty attempt at bring the Christian God back into the classroom in the USA by smuggling it in under the transparent fleece of pseudoscience. Read it for yourself and you too will see. Unless, of course, you are not a skeptic in the proper sense: your mind is made up.